Hertel 4140224 Cobalt Jobber Drill No 30 Tialn

Product Description

The HERTEL 4140224 is a cobalt jobber-length drill bit sized to wire gauge No. 30, which equals 0.1285 inch in decimal. It carries a TiAlN (titanium aluminum nitride) coating that extends tool life when drilling harder alloys, stainless steels, and abrasive materials at elevated temperatures. The 135-degree split point geometry reduces thrust force and walking at start, making it well suited for production drilling without a center punch. At 2.75 inches overall length with a 1.625-inch flute, this bit fits standard drill chucks and CNC toolholders with a straight cylindrical shank of 0.1285 inch diameter. Trades personnel in HVAC, plumbing, and electrical fabrication shops keep this size on hand for sheet metal, bracket, and panel work.

The No. 30 wire-gauge drill is commonly used when drilling pilot holes for tapping, riveting, or installing small-diameter fasteners in ferrous and non-ferrous metals. It fits the heavy-duty jobber series, making it appropriate for drill presses, hand drills, and CNC drilling operations where a repeatable, precise hole diameter is required. The right-hand spiral flute with regular helix evacuates chips efficiently in through-hole and blind-hole applications across light fabrication and maintenance tasks.

Key Features

• Cobalt construction provides heat and wear resistance beyond standard high-speed steel
• TiAlN coating extends cutting life in hard and abrasive metals
• 135-degree split point reduces drill walk and entry thrust force
• Web-thinned, tapered web configuration improves chip clearance and cutting efficiency
• Straight cylindrical shank fits standard 3-jaw chucks and CNC collets
• Right-hand spiral flute clears chips consistently in both hand and machine drilling

Compatibility

Designed as a standard jobber-series drill bit fitting any drill press, hand drill, or CNC machine equipped with a chuck or collet sized for a 0.1285-inch straight shank.

Installation Notes

Drill bit installation and replacement should be performed with the drill or machine fully powered down and the chuck key removed before securing the bit. Use appropriate cutting fluid or coolant when drilling ferrous metals at sustained feed rates to protect the coating and extend tool life. Secure the workpiece firmly before drilling to prevent movement and ensure hole accuracy. Dispose of worn or chipped drill bits per applicable shop safety procedures.